Workshop Episode: CG’s ongoing electronics tests, Jesse’s Level 3 project

In this episode, CG talks about how his electronics developments have come along  Specifically, what he learned from the first test flight of Mr. Bean (DEMO-1 mission), and the successful CG and Mr. Bean second launch (DEMO-2) where his code & flight computer successfully controlled a flight event!  His journey to his Level 2 certification is underway!  Read the details here. CD and Gheem @ "Mission Control" Jesse's Level 3 project starts to take shape!  He gives us some details, though he's a bit secretive on the details right now! Another view of Jesse's L3 Rocket Jesse's tube glassing work on his L3 rocket project

University of Akron’s “Akronauts” rocket team

Welcome to episode 6.96! We are joined by the University of Akron's "Akronauts" rocket team! https://youtu.be/GdPte4BRgZU The following team members met with us for this episode: Team President - Emily Armbrust Chief Engineer - Blake Bowser Former Team President - Mattew Stanko Treasurer - Olivia Renkel Former Chief Engineer - Mattew Reppa Project Manager - Jon Davis The Akronauts formed in 2014, and have been involved in a number of national STEM focused rocket competitions, including NASA Student Launch(USLI), and Spaceport America Cup The group presents a fun and detailed overview of what their team is all about, and a couple of their recent competition projects. The UA Akronauts NASA Student Launch Overall Winners and Awards 2020 University Student Launch Initiative Top 10 Overall Winner: Vanderbilt University, Nashville, Tennessee 2nd Place: University of North Carolina at Charlotte, Charlotte, North Carolina 3rd Place: University of Alabama in Huntsville, Huntsville, Alabama 4th Place: University of Akron, Akron, Ohio 5th Place: North Carolina State University, Raleigh, North Carolina 6th Place: University of Notre Dame, South Bend, Indiana 7th Place: Auburn University, Auburn, Alabama 8th Place: Oregon State University, Corvallis, Oregon 9th Place: Purdue University, West Lafayette, Indiana 10th Place: University of Cincinnati, Cincinnati, Ohio You can visit their website at https://akronauts.org/

James Duffy – Scale Modeling, FAI, and more!

In this episode, we chat with James Duffy, an accomplished scale modeler and competitor in FAI international model rocketry competitions.

James’ main specialties in scale modeling are the Bumper WAC – an early American two-stage sounding rocket consisting of a captured German V-2 first stage with a WAC Corporal cobbled on top as a second stage…

Bumper 8 lifting off from Cape Canaveral
James Duffy’s scale Bumper WAC

…and the Little Joe test vehicle, which NASA used during Project Mercury to test the launch escape system (the Little Joe II was later used for the same purposes for Project Apollo) and heat shield.

One impressive model James has flown in international competitions is his 1/12 scale Little Joe.

We discuss scale modeling and get his advice, and James tells us about FAI international model rocketry competitions. The American team has made a bid to hold the World Championships here in the United States in 2023. This would be the first time the international fly-offs will have been held in the U.S. since 1992.

Also, check out Spacemonkey Models (CLICK HERE), James’ company selling the most detailed scale model V-2 available anywhere. It’s a static model (which means it doesn’t fly), but it can be converted to a flying model rocket with a conversion kit sold by Apogee Components (CLICK HERE to get it). You can also buy the Spacemonkey V-2 itself from Apogee.

I have one of the Spacemonkey kits, and it’s a gorgeous thing. James has a thorough video tutorial series for building the V-2 on his YouTube channel. CLICK HERE to go to the playlist.

The kit comes with four different decal sets, so you have what you need to build one of four different iterations of the V-2, and the decals fit almost perfectly to the Estes V-2, so with a Spacemonkey kit you have the decals to build three more flying models!

Gary Rosenfield and Aerotech’s High Power projects

Welcome to Episode 6.95! Gary Rosenfield joins us to talk about new high power rocket offerings from Aerotech, and to talk to us about high power rocketry as well. Gary Rosenfield He also talks about Hamster Dance competition that he has been into lately, and if you're looking for more information on that event, you can look here: http://www.rimworld.com/tripoligerlach/hamsterdance/about.html And at their new Facebook Group called Hamster Dance Flyers here: https://www.facebook.com/groups/690838108136308 After the interview, Jesse and CG talk about their projects. CG gives more information he has found in his post-test flight of his rocket electronics system, and talks about a spinoff project! CG's mini altimeter project Jesse has evolved his tube glassing techniques, and talks about CG Holding his mini altimeter. them, and much more!

July 2020 Workshop Episode

Welcome to episode 94 of The Rocketry Show We’ve been on a roll with great guest interviews lately. The team take a quick break from that this episode to focus more on the results of a few rocketry projects they’ve been working on! Jesse has been ‘fiberglassing’ a new kit, and building more rockets, but more importantly, recently launched his LOC Precision “Big Nuke”. He tells us all about those, and more! LOC Precision Big Nuke 4, which Jesse has reviewed on the show, flying on an Aerotech K550W to 3189ft! He finally got that in the air on July 17, 2020   Jesse is still putting finishing touches on a Executioner clone. Fiberglassed 29mm and full Dual Deploy Capable. Level 3 project planning including sizing, figuring weights, and which composites to use for each purpose!     Gheem has been building a beautiful X-15 kit, and he catches us up on where he is on that, as well as a few more projects. Gheem’s SNGAero X-15 Grande finishes and ready to fly!   Gheem’s original Estes Pro Series launch controller modified to use lipo batteries On July 25, 2020, CG finally got to test his Radio Telemetry system. Because of all of the “Covid 19 delays, this test ended up being a “full up” test, which means about 5 tests (each would normally have been their own launch) all happening on one launch. Liftoff of CG's Mr. Bean rocket, marking the first test flight of his flight computer / GPS / radio telemetry system! He’ll share how that went!   The receiver & antenna for CG's telemetry system. We also pull some of your emails from the Mailbag that we didn’t have time to get to on earlier episodes!

Gary Rosenfield of AeroTech and Quest Aerospace

In this episode, we talk with Gary Rosenfield, who founded AeroTech Consumer Aerospace in 1982. AeroTech makes ammonium perchlorate composite propellant motors, often referred to as simply “composite motors.” This distinguishes them from the traditional model rocket motors, which use black powder propellant.

AeroTech is known for making high power motors, up to the enormous M, N, and O impulse motors. But they also make low and mid power motors for model rocketeers.

A small selection of AeroTech reloadable motor casings

Around 2014, AeroTech merged with Quest Aerospace, a model rocket company which manufactured kits and black powder motors. The motors were rather similar to the Estes black powder motors, but included the much-loved Q2G2 igniters.

An Estes C6-5 on left, with a starter. An old Quest C6-5 on right, with the Q2G2 igniter.

Q2G2’s were fast igniters. That is, they required less amperage to fire, and with a small black pyrogen tip, they were great for igniting black powder clusters – configurations of two or more motors.

With clusters, it’s important to have all motors ignite simultaneously, or the rocket could leave the pad with one or more motors unlit. This can sometimes result in a less-than-straight flight trajectory, and it’s what makes clustering a fun challenge!

Following an accident in a port in China, through which Quest’s old motors were exported to the U.S., Quest motors and igniters became unavailable for a long time.

Bill Stine, who had founded Quest, challenged Gary to create an A-impulse motor with composite propellant.

Gary accepted the challenge, and after a long period of development and experimentation, the new Quest composite motors became a reality.

Dubbed “Q-Jets,” these little 18mm motors are the same length and diameter as standard A/B/C model rocket motors, but because they contain the more energetic AP composite propellant, Quest/AeroTech can get a D powered motor into the smaller sized casing.

A Quest Q-Jet D motor, top, is the same size as an Estes C engine, bottom. The narrow part sticking out on the right of the Q-Jet is the ejection charge well.

This is because AP propellant has a higher specific impulse than black powder propellant.

Q-Jets are fast, fun, zippy motors. And AeroTech has lots of different AP motors for rockets of all sizes.

You can get Q-Jet’s from our sponsor, eRockets.biz, by clicking here.

And you can get AeroTech motors from eRockets by clicking here.

And, hey, if you appreciate eRockets sponsoring The Model Rocket Show, let owner Randy know when you place your order! I’m sure he’d love to hear that his support is appreciated.

#93: Matt Steele on Rocket Staging (Part 1)

Matt Steele joins the show to kick start the first of at least a couple episodes on staging techniques for Model Rockets. Mr. Steele is a longtime rocketeer, owner of North Coast Rocketry, and is a Professional Rocket Scientist! Our guest, Matt Steel We first define ground rules you can follow to ensure the best probability for success. Rules adapted from professional Rocket Engineering Sciences. We think this will help hobby rocketeers a lot. The methods Matt Steele discusses can be applied any new rocketry project or technique. After laying the ground rules, we jump into the first part of this episode on multi-stage rocketry. Part two will appear in a few weeks after we have a chance to gather your e-mail questions on the subject. Later in the show, we share our first peak into new beta firmware being tested for the Flight Sketch altimeter. Thanks to listener Phil Parslow for suggesting the topic of multiple rocket stage launches!!

#92: Scott Binder of SBR Fusion Rocket

Scott Binder joins us to to talk about things at FusionRocket.Biz, and -more importantly- hangs with The Rocketry Show team to talk model rocket stories, and fun memories. :-) Scott's scratch built "sport scale" Falcon 9 rocket mentioned in this episode.     Scott's eye for detail is amazing. Check out the detail on the back end!       Launch day!! Liftoff!!!   Later, CG, Gheem, and Jesse talk shop on the projects they are working on! Enjoy!

#4 – The FAQ – Questions, Volume 1

In this episode the Rocket N00b answers some model rocketry questions – some beginner’s questions commonly asked on online forums, as well as a couple questions sent to him through social media.

“What’s the Best Glue?”

Yes, we know. This question gets asked a LOT online, and some rocketeers get tired of seeing it. But it’s a good sign – it means there are new people entering the hobby all the time. That’s good for us, as it means more people to support our vendors of kits and motors, as well as greater awareness of this safe and awesome hobby.

The long answer is on the show (the N00b does tend to ramble). The short answer: for most model rocketry applications, you want to use white or yellow glue. Brand is pretty unimportant – pick one you like. The bond formed between paper and wood with these glues is stronger than the materials themselves. If a fin breaks off, it’s not the glue that failed – it’s probably that the body tube’s paper has ripped off, or a fin has snapped at the root.

Here’s a video sent to the N00b by Kirk G. showing a strength test of various white and yellow glues.

Obviously the construction technique here is quite different from what you’d be doing when building a model rocket, but it does illustrate the point that these glues are plenty strong.

Here’s the link to the Titebond page showing the differences between Titebond I, II, and III.

And here’s a quick video from Titebond comparing the three glues.

We also talk about epoxy, CA or super glue, plastic cement, glue sticks, and finally, hot glue (DO NOT USE HOT GLUE).

The plastic cement the N00b mentioned (but couldn’t remember the name) was Plastruct Plastic Weld.

eRockets.biz

The rockets the N00b mentioned during our sponsor segment – eRockets.biz – were by New Way. You can look at all the New Way kits eRockets carries by clicking here.

“Do Engines/Motors Go Bad?”

A lot of times, people will have rocket motors from a decade ago or more. Many people on the forums ask if they’ll still be good.

The fact is that model rocket motors, whether they are black powder or composite motors, do not have an expiration date. The important thing is how they’re stored. If they’ve gone through a lot of hot and cold temperature cycles over the years, the propellant grains can crack, making them more prone to catastrophic motor failures, or CATOs.

But people have flown 30-40 year old motors with no problems.

Some composite propellants, such as White Lightning or White Thunder propellants, can have some surface oxidation on them, making them harder to light, but that’s about it. Again, temp cycling may be a problem, but if properly stored, they don’t really “go bad.”

If you’re not sure, you can always soak old motors in water and dispose of them, and get new ones. Or, heck, fly ’em. That’s what minimum safe distances are for! (Click here to see the Model Rocket Safety Code.)

“How Do You Fill the Seam Between Two Body Tubes?”

Some kits come with two short body tubes, instead of one long one, and you’re supposed to join them together with a tube coupler. A follower on Instagram asked the Rocket N00b, “How do you fill in the seam so it looks like a single tube?”

It can be done easily. But the first thing to ask yourself is if you actually want to do that. There are two good reasons not to fill in that joint.

The first is if the rocket is to be painted two colors, and the color separation coincides with the length of the body tubes.

Here’s one of the N00b’s favorite Estes rockets, the Cosmic Explorer. The top is black and the bottom white.

If you paint the rocket first, with the top black and bottom white, and only glue the tubes together at the very end, you’ll have a perfect color separation – a straight line, no bleed through of the black paint onto the white – and because of the color difference, you won’t see the seam.

The second reason is you might want to convert the rocket into a payload carrying vehicle. Some kits come with a payload section. Instead of a hollow tube coupler, they come with a balsa bulkhead called a nose block. 

But even if there’s just a coupler, you can make your own bulkhead from heavy card stock, balsa, or basswood, add a small loop of Kevlar string, and now you have a payload section. Instead of blowing off the nose cone, the rocket will separate at the coupler during parachute ejection. You can fly your payload (such as an altimeter) in the upper section and keep it safe from ejection gasses.

The Estes U.S. Army Patriot is a perfect kit for this conversion. So is any kit with two tubes.

But if you do want to make one seamless tube out of two, you can use Elmer’s Carpenter’s Wood Filler.

Thin it until you can brush it on with a paint brush, and coat an area around the seam about two inches long. Once it’s dry, sand it smooth. Even if the tubes are a little uneven in their thickness, the wood filler can cover that up. The rocket will be slightly thicker in that spot, if you measure it with a digital caliper, but you won’t see it.

The Estes Hi Flier XL comes with a two part body tube. Elmer’s CWF brushed on the joint and sanded smooth can conceal the line.

“What Kinds of Cameras Can You Put On a Model Rocket?”

A number of small video cameras can be attached to a model rocket to record the flight. A very popular kind is called an 808 keychain camera. This little “spy camera” looks like a key fob. They’re cheap and compact, and can simply be taped to the side of a rocket with electrical tape.

These little cameras range from very cheap (less than $10) to not so cheap (some cost between $70-90). Quality varies a lot, but even the cheap ones may be good for fun.

Little cameras like this can simply be attached to the side of a rocket with electrical tape.

MateCam seems to be a popular brand among rocketeers. Aside from video quality being on the better end, MateCams have a larger lens assembly. You can take one apart and arrange its guts to fit a special project.

The little cameras the N00b mentioned are called flash drive cameras.

There are a number of kinds of so-called “flash drive cameras,” but the ones referred to here can be found on eBay for less than $9.

Here’s video of the hidden camera payload rocket, the Ceres B booster with ICU2 payload, the design of which came from Mike Westerfield’s book, Make: Rockets: Down-to-Earth Rocket Science.